I'll go first.
  1. Stoat
    D385197a a07c 4db4 b29a 27f25d04f48d
    Seriously these little guys will rip your fucking face off. They kill larger animals by biting the base of their neck.
  2. slow loris
    9ddcb826 8289 42b2 b2fd 26ae03b85d2b
    poison comes out of their elbows apparently what the actual fuck am i right?
    Suggested by @bisexual
  3. Honey badgers
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    As with other mustelids of relatively large size, such as wolverines and badgers, honey badgers are notorious for their strength, ferocity and toughness. They have been known to savagely and fearlessly attack almost any kind of animal when escape is impossible, reportedly even repelling much larger predators such as lions.[27]
    Suggested by @MichaelRose
  4. Duck billed platypus
    Deceptively cute. Equipped with poison-injecting barbs on their hind legs!
    Suggested by @G483